From the same page I referenced above:
"The crew comprised 3 members and defensive armament consisted of one WT 81Z (twin fixed 7.9mm MG 81 machine gunes) firing forward from a bulged housing offset to port beneath the forward fuselage, one fixed or one flexible forward firing MG 81, and a similar weapon firing aft from the rear of the cockpit glazing."
Here is some pics of the pic, front, and a close up of the front showing the gun's housing.
And I did find in it where it did say the H-1 H-2 saw operational service under the Fliegerfuhrer Atlantik.